You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query-continue>
    <alltransclusions gatcontinue="Invite_These_Media_Ministries" />
  </query-continue>
  <query>
    <pages>
      <page ns="10" title="Template:Communities" missing="" />
      <page pageid="6128" ns="10" title="Template:Background and History" />
      <page pageid="7100" ns="10" title="Template:Bible" />
      <page pageid="6238" ns="10" title="Template:Categories" />
      <page pageid="4023" ns="10" title="Template:Footer" />
      <page pageid="4226" ns="10" title="Template:Glossary People" />
      <page pageid="4069" ns="10" title="Template:Header" />
      <page pageid="7271" ns="10" title="Template:Header for Media Spin" />
      <page pageid="6405" ns="10" title="Template:Header for Radio" />
      <page pageid="7186" ns="10" title="Template:In Memory of Media Workers" />
    </pages>
  </query>
</api>